This is the 3118th most frequent Chinese word.
theresa
The word "theresa" is not a Chinese word; it is a common Western name.
In this sentence, '特蕾莎' is used as a proper noun referring to a person's name.
特蕾莎是我们学校的新老师。
Theresa is the new teacher at our school.
Here, '特蕾莎' again is used as a proper noun representing a person accompanying the subject.
我昨天和特蕾莎一起去了图书馆。
I went to the library with Theresa yesterday.
In this instance, '特蕾莎' is utilized as a possessive subject, attributing qualities to her teaching methods.